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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 2
 1
 8

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.6 Nm
 16.55 Nm
 15.28 Nm
 15.92 Nm

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 700 W
 650 W
 600 W
 625 W

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 produce sparking at brushes.
 develop excessive speed and damage itself.
 open fuse or circuit breaker.
 draw too much current.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 4 V
 0 V
 2 V
 1 V

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 None of these.
 No load.
 Low load.

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